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core: add an ability to use cxx11 lambda as a parallel_for_ body

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Vladislav Sovrasov
2017-06-28 13:57:24 +03:00
parent 82ec76c123
commit 3c748ccf10
3 changed files with 57 additions and 1 deletions
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samples/cpp/tutorial_code/core/how_to_use_OpenCV_parallel_for_/how_to_use_OpenCV_parallel_for_.cpp
+25
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@@ -101,10 +101,35 @@ int main()
//! [mandelbrot-transformation]
double t1 = (double) getTickCount();
#if __cplusplus >= 201103L
//! [mandelbrot-parallel-call-cxx11]
parallel_for_(Range(0, mandelbrotImg.rows*mandelbrotImg.cols), [&](const Range& range){
for (int r = range.start; r < range.end; r++)
{
int i = r / mandelbrotImg.cols;
int j = r % mandelbrotImg.cols;
float x0 = j / scaleX + x1;
float y0 = i / scaleY + y1;
complex<float> z0(x0, y0);
uchar value = (uchar) mandelbrotFormula(z0);
mandelbrotImg.ptr<uchar>(i)[j] = value;
}
});
//! [mandelbrot-parallel-call-cxx11]
#else
//! [mandelbrot-parallel-call]
ParallelMandelbrot parallelMandelbrot(mandelbrotImg, x1, y1, scaleX, scaleY);
parallel_for_(Range(0, mandelbrotImg.rows*mandelbrotImg.cols), parallelMandelbrot);
//! [mandelbrot-parallel-call]
#endif
t1 = ((double) getTickCount() - t1) / getTickFrequency();
cout << "Parallel Mandelbrot: " << t1 << " s" << endl;